<!DOCTYPE html><html lang="[&quot;zh-Hans&quot;,&quot;zh-CN&quot;,&quot;default&quot;]"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><meta name="description" content="nextjs配合redux笔记"><meta name="keywords" content="ssr"><meta name="author" content="wenmu"><meta name="copyright" content="wenmu"><title>nextjs配合redux笔记 | 温木的博客</title><link rel="shortcut icon" href="/melody-favicon.ico"><link rel="stylesheet" href="/css/index.css?version=1.6.1"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/font-awesome@latest/css/font-awesome.min.css?version=1.6.1"><link rel="dns-prefetch" href="https://cdn.staticfile.org"><link rel="dns-prefetch" href="https://cdn.bootcss.com"><link rel="dns-prefetch" href="https://creativecommons.org"><link rel="dns-prefetch" href="http://ta.qq.com"><script>(function() {
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<p>with-redux-store 的代码如下</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">"react"</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; initializeStore &#125; <span class="keyword">from</span> <span class="string">"../store"</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> isServer = <span class="keyword">typeof</span> <span class="built_in">window</span> === <span class="string">"undefined"</span>;</span><br><span class="line"><span class="keyword">const</span> __NEXT_REDUX_STORE__ = <span class="string">"__NEXT_REDUX_STORE__"</span>;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getOrCreateStore</span>(<span class="params">initialState</span>) </span>&#123;</span><br><span class="line">  <span class="comment">// Always make a new store if server, otherwise state is shared between requests</span></span><br><span class="line">  <span class="keyword">if</span> (isServer) &#123;</span><br><span class="line">    <span class="keyword">return</span> initializeStore(initialState);</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  <span class="comment">// Create store if unavailable on the client and set it on the window object</span></span><br><span class="line">  <span class="keyword">if</span> (!<span class="built_in">window</span>[__NEXT_REDUX_STORE__]) &#123;</span><br><span class="line">    <span class="built_in">window</span>[__NEXT_REDUX_STORE__] = initializeStore(initialState);</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> <span class="built_in">window</span>[__NEXT_REDUX_STORE__];</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> App =&gt; &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="class"><span class="keyword">class</span> <span class="title">AppWithRedux</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span> </span>&#123;</span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">async</span> getInitialProps(appContext) &#123;</span><br><span class="line">      <span class="comment">// 在这可以把一些服务端请求数据对state进行初始化，如果没有就用下面注释掉的默认方式</span></span><br><span class="line">      <span class="keyword">if</span> (isServer) &#123;</span><br><span class="line">        <span class="keyword">const</span> &#123; req &#125; = appContext.ctx;</span><br><span class="line">        <span class="keyword">const</span> session = req.session;</span><br><span class="line">        <span class="comment">// 根据放到session中的用户数据初始化state</span></span><br><span class="line">        <span class="keyword">if</span> (session &amp;&amp; session.userInfo) &#123;</span><br><span class="line">          reduxStore = getOrCreateStore(&#123; <span class="attr">user</span>: session.userInfo &#125;);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">          reduxStore = getOrCreateStore();</span><br><span class="line">        &#125;</span><br><span class="line">      &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        reduxStore = getOrCreateStore();</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="comment">// Get or Create the store with `undefined` as initialState</span></span><br><span class="line">      <span class="comment">// This allows you to set a custom default initialState</span></span><br><span class="line">      <span class="comment">//const reduxStore = getOrCreateStore()</span></span><br><span class="line"></span><br><span class="line">      <span class="comment">// Provide the store to getInitialProps of pages</span></span><br><span class="line">      appContext.ctx.reduxStore = reduxStore;</span><br><span class="line"></span><br><span class="line">      <span class="keyword">let</span> appProps = &#123;&#125;;</span><br><span class="line">      <span class="keyword">if</span> (<span class="keyword">typeof</span> App.getInitialProps === <span class="string">"function"</span>) &#123;</span><br><span class="line">        appProps = <span class="keyword">await</span> App.getInitialProps(appContext);</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="keyword">return</span> &#123;</span><br><span class="line">        ...appProps,</span><br><span class="line">        initialReduxState: reduxStore.getState(), <span class="comment">//获取服务端store中的state，传递给前端的store</span></span><br><span class="line">      &#125;;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">constructor</span>(props) &#123;</span><br><span class="line">      <span class="keyword">super</span>(props);</span><br><span class="line">      <span class="comment">// 创建前端的store实例，前端绑定store时必须使用这个实例，不然新创建的store实例肯定获取不到这个实例的内容，也就会造成state有值，但是就是拿不到</span></span><br><span class="line">      <span class="keyword">this</span>.reduxStore = getOrCreateStore(props.initialReduxState);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    render() &#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="xml"><span class="tag">&lt;<span class="name">App</span> &#123;<span class="attr">...this.props</span>&#125; <span class="attr">reduxStore</span>=<span class="string">&#123;this.reduxStore&#125;</span> /&gt;</span>;</span></span><br><span class="line"><span class="xml">    &#125;</span></span><br><span class="line"><span class="xml">  &#125;;</span></span><br><span class="line"><span class="xml">&#125;;</span></span><br></pre></td></tr></table></figure>

<p>在_app.js 中使用</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> App <span class="keyword">from</span> <span class="string">"next/app"</span>;</span><br><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">"react"</span>;</span><br><span class="line"><span class="keyword">import</span> withReduxStore <span class="keyword">from</span> <span class="string">"../lib/with-redux-store"</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; Provider &#125; <span class="keyword">from</span> <span class="string">"react-redux"</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">MyApp</span> <span class="keyword">extends</span> <span class="title">App</span> </span>&#123;</span><br><span class="line">  render() &#123;</span><br><span class="line">    <span class="comment">// 注意，这传给store的对象一定是里面返回的reduxStore这个，不能再重新获取一个</span></span><br><span class="line">    <span class="keyword">const</span> &#123; Component, pageProps, reduxStore &#125; = <span class="keyword">this</span>.props;</span><br><span class="line">    <span class="keyword">return</span> (</span><br><span class="line">      &lt;Provider store=&#123;reduxStore&#125;&gt;</span><br><span class="line">        &lt;Component &#123;...pageProps&#125; /&gt;</span><br><span class="line">      &lt;<span class="regexp">/Provider&gt;</span></span><br><span class="line"><span class="regexp">    );</span></span><br><span class="line"><span class="regexp">  &#125;</span></span><br><span class="line"><span class="regexp">&#125;</span></span><br><span class="line"><span class="regexp"></span></span><br><span class="line"><span class="regexp">export default withReduxStore(MyApp);</span></span><br></pre></td></tr></table></figure>
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